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【单选题】
蚯蚓的生殖特点是:A.
出芽生殖
B.
雌雄同体，异体受精
C.
雌雄异体，体外受精
D.
雌雄异体，异体受精
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举一反三
【简答题】阅读理解。 There are many ways of defining success. It is accurate to say that each of us has our own concept of success to the extent that each of us is responsible for setting our own goals and determini...
【简答题】SolidWorks零件造型时，可以用集合运算中（ ）的概念造型具有内部复杂型腔的结构形状。（“差”、“并”、“交”中选择）
【单选题】Many of us live our lives running behind time , but we only reach it when we ________ a heart attack .
A.
died from
B.
died for
C.
died in
D.
die of
【简答题】通过学习，小明了解到随意丢弃的废电池对土壤除了造成汞、镉等重金属污染外，还可能会产生其它污染，为此他设计如下实验进行探究：取某种废弃电池的内容物，加适量的水搅拌，过滤后取其滤液，将pH试纸直接浸人滤液中．测定其pH。依据上述事实完成下列问题： （1）过滤操作中下列仪器不需要的是 （请选序号）。 ①漏斗 ②烧杯 ③酒精灯 ④玻璃棒 （2）小明使用pH...
【单选题】It's navel gazing time again, that stretch of the year when many of us turn our attention inward and think about how we can improve the way we live our lives. But as we embark on this annual ritual of...
A.
They want to know if they get prepared for the future.
B.
They consider it beneficial to their future lives.
C.
They pay too much attention to their self-improvement.
D.
They overemphasize their progress in the past year.
【单选题】根据皮亚杰的观点，儿童能发现物体在水中受到的浮力与物体排开的水量有关，而与物体的质地无关，说明儿童的认知发展水平已处在 ( )
A.
感知运动阶段
B.
前运算阶段
C.
具体运算阶段
D.
形式运算阶段
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